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Allergy occurrence increased over the last decades.Here are some statistics from https://www.foodallergy.org/life-food-allergies/food-allergy-101/facts-and-statistics
- The Centers for Disease Control & Prevention reports that the prevalence of food allergy in children increased by 50 percent between 1997 and 2011.
- Between 1997 and 2008, the prevalence of peanut or tree nut allergy appears to have more than tripled in U.S. children.

Taking into account these figures, I think today people should pay great attention to understanding what allergy is and possible ways to avoid it. Please write an article about the causes of allergy and its endemic increase. And also about methods to prevent it.